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Derivative Instruments - Summary of net realized gains (losses) recorded in the consolidated statements of income (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Net realized gains (losses) on derivative instruments    
Net realized gains (losses) on derivative instruments [1] $ 99 $ (10)
Not designated as hedging instrument    
Net realized gains (losses) on derivative instruments    
Net realized gains (losses) on derivative instruments 99 (10)
Not designated as hedging instrument | Futures contracts    
Net realized gains (losses) on derivative instruments    
Net realized gains (losses) on derivative instruments 46 (14)
Not designated as hedging instrument | Foreign currency forward contracts    
Net realized gains (losses) on derivative instruments    
Net realized gains (losses) on derivative instruments 30 (1)
Not designated as hedging instrument | Other    
Net realized gains (losses) on derivative instruments    
Net realized gains (losses) on derivative instruments [2] $ 23 $ 5
[1] See note 10 for information on the Company’s derivative instruments.
[2] Includes realized gains or losses on swaps, options and other derivatives contracts